After you’ve ordered your new garage door, we’ll perform a site inspection to confirm your door size. We’ll contact you to schedule the installation, and our professional installers will do the rest. They’ll deliver your door, take down the old door, reconnect your opener if there is one, seal your perimeter and provide a final walk-through where they’ll clean up the area and haul away your old door. Additional fees for haul away may apply in some markets. We are happy to provide answers to questions you may have at the time of your garage door and opener installation. http://www.youtube.com/watch?v=Z_eZc-kh40c
9.15 Install the bolts to secure the stationary center cones to the center bracket. Position the shaft here so it is the same distance from the header as the shaft is at each end. Finger-tighten the nuts until the stationary cones are flush against the center bearing plate. Forcing the cones by tightening the bolts may break a cone if it is catching on a bearing. Winding torsion springs with cracked cones can cause the springs to spin loose and the bars to fly. Secure the bolts.
Luckily, your garage door is a pretty sound investment. According to Garage Wow Now, garage doors were ranked in the top three for home improvements whose costs are recouped through increased home value. Similarly, realtors regularly increased the list price of a home with a new garage door by 1 to 4 percent! That means, if you spend $2000 on a new garage door, you can increase the value of your home by almost $8000 if you have a $200,000 home. Furthermore, compared with the other two highest rated improvements — siding replacement and deck installation — a garage door replacement is far more affordable.
Overhead Door Company of Dallas/Fort Worth is North Texas' official Overhead Door distributor. For over 50 years we have been providing quality residential and commercial garage doors and fast and dependable garage door repair service not only to Dallas and Fort Worth, but to all cities in the DFW Metroplex. We are dedicated to 100% customer satisfaction.
Guest 9232954 -- check out the other answers for this question, and the links below the answers for even more - seems from $125-400 range from different contributors (should be replaced in pairs for balanced lifting unless one spring is quite new), about $200-250 or 300 seems a common charge. The springs themselves generally run about $20-50 each depending on lead they have to carry.

The track is secured with these little brackets and they're adjustable. There's a slot that it rides in so you can unscrew it here and adjust it if you need to. And you're going to have to pay attention and look at it closely to make sure it's in the right spot, but it's not that tricky and you can do it. And usually one side is out of alignment so you can compare it to the other and then adjust it as needed. https://youtube.com/watch?feature=youtu.be&v=Z_eZc-kh40c
Overhead Door Company of Dallas/Fort Worth is North Texas' official Overhead Door distributor. For over 50 years we have been providing quality residential and commercial garage doors and fast and dependable garage door repair service not only to Dallas and Fort Worth, but to all cities in the DFW Metroplex. We are dedicated to 100% customer satisfaction.
A standard double garage door is 7 ft. high by 16 ft. wide. Standard single doors are 7 ft. high by 8 or 9 ft. wide. Because the doors are so large, few home centers and only some garage door stores keep many doors in stock, so expect to order one instead of buying it off the shelf. Garage doors are available in wood, fiberglass and steel. Steel doors, like ours, are light, maintenance-free, affordable, readily available, and have an insulating value as high as R-19. 
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